Natures Pure Spa® Clarifier is a cationic polymeric flocculant formulated to thicken and coagulate fine suspended solids from the spa. After adding Natures Pure Spa® Clarifier, these solids will be filtered out of the hot tub or collected on the bottom for removal. Natures Pure Spa® Clarifier helps clear cloudy water in spas and hot tubs. Use on start-up and once a week. The routine weekly dose is 1 ounce per 250 gallons of water.